Production capacity calculation method and economic benefit evaluation method of in-situ heating production of oil shale

Abstract

The invention discloses a production capacity calculation method and an economic benefit evaluation method for in-situ heating production of oil shale. The production capacity calculation method includes the following steps: testing the basic parameters of oil shale at different temperatures, and the basic parameters include density, Porosity, thermal conductivity, through data fitting to obtain the model of each basic parameter changing with temperature; calculate the permeability and thermal diffusivity of oil shale at different temperatures; establish a mathematical model for the energy conversion of electric heaters, and calculate the heating efficiency; Establish the temperature field of in-situ heating production of oil shale, and obtain the analytical solution of the seepage pressure field coupled with the temperature field; establish a production calculation model to calculate the production capacity of in-situ heating production of oil shale. The invention establishes a heat transfer model and a non-isothermal seepage model in the period of opening a heating well and opening a production well, and establishes a production calculation model on the basis of a seepage model coupled with a temperature field and a pressure field, and can calculate and obtain a more accurate oil shale in-situ Capacity for heating production.

Description

technical field [0001] The invention relates to the technical field of shale oil development, in particular to a production capacity calculation method and an economic benefit evaluation method for in-situ heating production of oil shale. Background technique [0002] Oil shale is a kind of sedimentary rock with an inorganic mineral framework and rich in organic matter (kerogen), mainly kerogen and a small amount of asphaltene. It is an immobile petroleum mineral. Oil shale can crack organic matter at high temperature and convert it into a brown viscous liquid product with a special pungent smell, called oil shale oil, sometimes referred to as shale oil for short. The burial depth of oil shale is less than 1000m, and the reservoir thickness is 50-150m. There are two main development methods: ground carbonization technology and in-situ conversion technology. It is more suitable for exploiting 0-500m oil shale with high oil content, and the underground in-situ conversion tech...

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Problems solved by technology

[0003] In terms of theoretical research, most scholars in my country have studied the cracking characteristics of oil shale under laboratory conditions, high-temperature physical properties, the change law of temperature field under different heating methods, and the physical properties of oil shale under rock pressure and thermal stress. However, there are few studies on the flow of shale oil in the reservoir after oil shale is cracked, and there are even less productivity calculation methods based on the non-isothermal seepage model that couples the temperature field and the seepage field. Economic Evaluation Method of Heating Production

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